Platform Events Developer Guide

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Platform Events Developer Guide
Delivering Custom Notifications with Platform Events
Defining Your Custom Platform Event
Publishing Platform Events
Subscribing to Platform Events
Set Up Debug Logs
Flows
Processes
Apex Triggers
Lightning Components
Pub/Sub API
CometD
Group Your Event Streams
Filter Your Event Streams
Platform Event Filters
Filter Expressions in Channel Members
Subscribe to the Channel and Receive the Filtered Event Stream
Get Custom Channels and Channel Members
Obtain a Platform Event’s Subscribers
Identify and Match Event Messages with the EventUuid Field
Testing Your Platform Event in Apex
Encrypting Platform Event Messages at Rest in the Event Bus
Monitor Platform Event Publishing and Delivery Usage
Considerations
Examples
Reference
PDF

Filter Your Stream of Platform Events with Custom Channels

Receive only the event messages that match a predefined filter on a custom channel. Create a channel, and configure it with a filter expression. Subscribers to the channel, including Pub/Sub API clients, Streaming API (CometD) clients, and event relays, receive a filtered stream of events. With fewer events delivered to subscribers, event processing is optimized. Also, subscribers make more efficient use of the event delivery allocation.
  • This feature is supported for high-volume custom platform events that you define. It isn’t supported for legacy standard-volume custom platform events or standard platform events, such as real-time event monitoring events.
  • This feature is supported in Pub/Sub API and Streaming API (CometD) subscribers but not in other types of subscribers, such as Apex triggers, flows, and processes.
  • If you use Government Cloud and your org was created before January 14, 2022, contact Salesforce to enable this feature. Government Cloud orgs created on or after January 14, 2022 have this feature enabled. This feature is available in all other clouds.

Note